Backups are a problem, to backup the scans I currently have would take roughly another 240TB of HDDs, which in the current market is around US$8,500 worth of drives, which is money I don’t have right now.
Every time a new print turns up, the storage cost alone to store the scan and make a backup is about US$1800 just in hard drives for a single film.
So some of the scans do not have backups, which is frustrating and dangerous, but unless a Simon Pegg-like-mega-fan with deep pockets, or the much wider community crowd funded a lot of HDDs, then having backups is unfeasible.
Making lower resolution ProRes copies of the raw scans is the best I can manage at the moment, but even that is a stretch sometimes due to lack of space.